A bag contains 5 white, 7 red and 8 black balls. If four balls are drawn one by one without replacem

English

Gujarati

Hindi

14.Probability

easy

A bag contains $5$ white, $7$ red and $8$ black balls. If four balls are drawn one by one without replacement, what is the probability that all are white

A

$\frac{1}{{969}}$

B

$\frac{1}{{380}}$

C

$\frac{5}{{20}}$

D

None of these

Solution

(a) Required probability $ = \frac{5}{{20}} \times \frac{4}{{19}} \times \frac{3}{{18}} \times \frac{2}{{17}} = \frac{1}{{969}}.$

Standard 11

Mathematics

Share

Similar Questions

A die is thrown repeatedly until a six comes up. What is the sample space for this experiment ?

easy

In a throw of a dice the probability of getting one in even number of throw is

hard

(IIT-2005)

The probability of happening an event $A$ in one trial is $0.4$. The probability that the event $A$ happens at least once in three independent trials is

easy

(IIT-1980)

In a relay race there are five teams $A, \,B, \,C, \,D$ and $E$. What is the probability that $A, \,B$ and $C$ finish first, second and third, respectively.

medium

A card is selected from a pack of $52$ cards. Calculate the probability that the card is an ace

easy